Hydraulic four-point leveling method with accuracy less than 1 minute

A four-point leveling, hydraulic technology, applied in elastic suspension, suspension, transportation and packaging, etc., can solve problems such as no specific formula is given

Inactive Publication Date: 2013-03-20
CNGC INST NO 206 OF CHINA ARMS IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Check out several patent applications using proportional valve leveling, such as patent No. 201110301964 (an automatic leveling system for body platforms) and 201020230901 (an automatic leveling system for chassis), etc., but it is only a general statement that PID control is used, and neither is given. specific formula

Method used

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  • Hydraulic four-point leveling method with accuracy less than 1 minute
  • Hydraulic four-point leveling method with accuracy less than 1 minute

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0119] A hydraulic four-point leveling method with an accuracy less than 1′ when the rigidity of the vehicle body is insufficient, characterized in that: four-point hydraulic outriggers are installed on the main beam of the vehicle body, pressure sensors are installed in each outrigger, and antenna base level sensors Located at 1 / 4 of the rear leg direction from the geometric center of the car body, its transverse and longitudinal axes are respectively parallel to the transverse and longitudinal axes of the car body; a chassis level sensor is installed at the front end of the car body, and its transverse and longitudinal axes are parallel to the transverse and longitudinal axes of the car body; The car body is horizontally narrow and vertically long; the four-point hydraulic outrigger is controlled by a current control proportional valve; the polarity of the vertical axis of the antenna base level sensor and the chassis level sensor is positive at the front and high at the front...

Embodiment 2

[0149] A hydraulic four-point leveling method with an accuracy of less than 1′ when the rigidity of the vehicle body is satisfied. It is characterized in that: four-point hydraulic outriggers are installed on the vehicle body girder, a pressure sensor is installed in each outrigger, and an antenna base level sensor is installed. Located at 1 / 4 of the rear leg direction from the geometric center of the car body, its transverse and longitudinal axes are respectively parallel to the transverse and longitudinal axes of the car body; a chassis level sensor is installed at the front end of the car body, and its transverse and longitudinal axes are parallel to the transverse and longitudinal axes of the car body; The car body is horizontally narrow and vertically long; the four-point hydraulic outrigger is controlled by a current control proportional valve; the polarity of the vertical axis of the antenna base level sensor and the chassis level sensor is positive at the front and high ...

Embodiment 3

[0179] A hydraulic four-point leveling method with an accuracy of less than 1′ when the rigidity of the vehicle body is satisfied. It is characterized in that: four-point hydraulic outriggers are installed on the vehicle body girder, a pressure sensor is installed in each outrigger, and an antenna base level sensor is installed. Located at the geometric center of the car body, its transverse and longitudinal axes are respectively parallel to the transverse and longitudinal axes of the car body; a chassis level sensor is installed at the front end of the car body, and its transverse and longitudinal axes are parallel to the transverse and longitudinal axes of the car body; the car body is horizontally narrow and vertically long; the four-point hydraulic outrigger is controlled by a current control proportional valve; the polarity of the vertical axis of the antenna seat level sensor and the chassis level sensor is positive for low front and high rear, and negative for high front ...

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Abstract

The invention relates to a hydraulic four-point leveling method with accuracy less than 1 minute. The hydraulic four-point leveling method with the accuracy less than 1 minute is characterized in that according to different conditions of insufficient car body rigidity and sufficient car body rigidity, firstly, four legs are laid on the ground and absolute values of a transverse shaft and a vertical shaft of a precise sensor are adjusted to 900 seconds based on the foundation. A precise leveling is conducted after a rough leveling is finished. The leveling adopts a method of a low point being aligned to a high point so that a lift leveling is achieved. Proportion integration differentiation (PID) operation is conducted towards a tilt error of the transverse shaft and the vertical shaft of the precise sensor, control is conducted after a controlled quantity of lifting legs is calculated. In the process of PID, an integration element overcomes a proportional valve dead zone and a differentiation element restrains continuous increase of a leveling speed. Compared with the prior art, the hydraulic four-point leveling method with the accuracy less than 1 minute is high in leveling accuracy, reasonable in arrangement of the transverse shaft and the vertical shaft leveling order, capable of overcoming direction deflection caused by the insufficient car body rigidity, various in leveling methods and capable of choosing different modes according to different car body structures.

Description

technical field [0001] The invention belongs to the field of four-point hydraulic leveling, and relates to a hydraulic four-point leveling method with a precision less than 1′, which is applicable to high-precision leveling occasions of four-point hydraulic proportional valves for car bodies and platforms. Background technique [0002] Hydraulic 4-point leveling is more difficult than 3-point leveling, and the accuracy of 4-point leveling is mostly around 3′, rarely within 1′. For example, the accuracy of a certain search radar is 3', the literature reports are 2', 2.5', 3', 3.4', 3.6', the patent 200810036547 (mobile carrier automatic leveling system) accuracy 3', 200810037838 (automatic leveling system control method ) accuracy 3′, 201110154901 (a car body leveling method based on electro-hydraulic proportional valve control) accuracy 5′. [0003] There are many methods for 4-point leveling, such as the horizontal and vertical decoupling method, the low-point stroke metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60G17/015
Inventor 肖鉴刘艳行
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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